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Silver Member Username: JbaileyIndianapolis, Indiana Post Number: 178 Registered: Mar-05 | I am just curious to know if the built in fuses on amplifiers are a reliable indication of how much current they can/will draw? If my two amplifiers (PPI AX400 and Zapco 500.1) together have built in fuses totaling 70 amps (30 and 40, respectively), should I assume that the current draw from these amps at full power will not exceed 70 amps total, give or take a little? Thanks for the help. |
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Gold Member Username: IlluminatorUSA Post Number: 1709 Registered: Apr-05 | Nah, the fuses give a somewhat accurate guess. What is the RMS output and how many channels are you using on each amp? |
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Silver Member Username: James_gTN Post Number: 234 Registered: Jul-05 | The current draw at full power can exceed the 70 amps, but not for too long. The fuses will allow more current than the rating for a certain period of time. The current draw will also depend on the impedance. If the amp is stable at 2 ohms or 1 ohm, then the fuse is large enough to allow the proper current for that load. If you run at 4 ohms, the current draw will likely be far less. The fuse rating gives you a general idea of what the amp can draw at its highest output, but it's not definitive. |
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Platinum Member Username: GlasswolfWisteria, Lane USA Post Number: 10538 Registered: Dec-03 | there are formulas for calculating current draw from your amplifier here: http://www.wickedcases.com/caraudio/charging.html |